Internal grinding and cutting tool



Judy w, wm J W BALEY 1,966,277

INTERNAL GRINDING AND CUTTING TOOL Filed Jan. 18, 1952 Figi Figa. E K

77:15 ATTOR/VEX' Patented `nly 10, 1934 NITED STATES PATENT OFFICE Application January 18,

1932, Serial N0. 587,247

In Great Britain January 21, 1931 4 claims. (cl 511s4.3)

This invention relates to devices for grinding or cutting cylinders or for other such like purposes, and it is proposed to be used mainly for grinding or re-boring the cylinders of internal 5 combustion engines. When intended for use in grinding operations the present invention is one of the kind comprising several grinding elements (usually iive) in the form of carborundum strips spaced upon the circumference of an imaginary cylinder equidistantly from the centre and parallel with its axis, mounted in channelled holders upon the outermost edges of radially disposed plates held in a carrying body in such a manner that they have a limited play for adjustment in a radial direction but otherwise remain rigidly held in their common holder. In a known contrivance such adjustment is performed by means of a screw-threaded rotatable central member bearing one or more cones mounted thereon and adapted to act upon an inclined surface or surfaces formed on the inner edges of the plates aforesaid in such a manner as to force or tend to force such plates radially apart, whereby the outermost extremities of the grinding strips bear upon the walls of the hollow article under treatment continuously whilst the holder with its plates is revolved by a exibly attached source of power or otherwise and at the same time moved up and down (such as by hand) so that the entire surface may receive equal treatment. The range of adjustment in a radial direction in such arrangements as are already known is limited by the pitch or effective length of the cones, in conjunction with a number of sets of plates 3 or carriers, to 11/2 inches or thereabouts, and can certainly not be so adjusted as to render one and the same holder serviceable for grinding cylinders of widely different diameters, e. g. 1% in. up to 51/2 in. It has been necessary therefore to go to the expense of stocking generally from two to four different holders and from four to six sets of carriers with each holder, (according to the model of cylinder to be re-bored or ground) in order to accommodate the usual standard sizes of cylinder from the smallest to the greatest bore in the equipment for example, of a well-ordered motor repairing garage. Similar conditions prevail when a cutting device is in question as with a grinding device, as in either case it is necessary to have several holders or heads of varying sizes in stock.

The object of the present invention is to enable an equally large range of adjustment as y heretofore to be secured in an improved manner with only one holder or head specially adapted for the purpose, and any convenient number of grinding stones or cutters mounted thereon. Any other means for expanding the grinding or cutting members may be used in place of the cone radial adjustability annular means secured around the holder or head so as to add to the diameter of same and to become virtually an integral part thereof, said means possessing radial guide slots or passages therein in continuation of those already present in the holder or head, in order thus to provide for the substitution of carriers or blades of larger width for the purpose of grinding or cutting at a correspondingly greater distance from the axis of the holder or head, together with means for imparting the desired radial adjustment movement to the carriers or blades alike whether these be of larger or smaller width.

Reference will hereinafter be made to the accompanying drawing illustrating, by Way of example forms of the present invention as applied to a grinder and to a cutter.

Figure l is a section on line 1 -1X of Fig. 2 85 of a grinder and Figure 2 is a sectional elevation of same.

Figure 3 is a section on line 3 -3X of Fig. 4 and Figure 4 is a sectional elevation of same.

Referring to Figs. 1 and 2, A A represents 90 the grinding stones held in metal sheaths within channelled carriers B B (one being omitted for clearness) made of hardened steel and made integral with (or fastened upon) plates C C which are provided with extensions at top and bottom having a sliding fit within radial grooves D in the top and bottom discs E E joined together by distance rods F F, this being usual practice. The inner edges of the plates C are provided with recesses having inclines G and a screw-threaded central pin H bears cones J threaded thereon which engage with said inclines so that rotary adjustment of the pin H (by means of a graduated dial) produces radial movement of the plates C, as in known manner, for the purpose of adjusting the grinding diameter of the tool. The invention, in the example under consideration, provides for the tting of a ring K closely around the disc E, this provision being made both at the top and the U0 bottom end of the tool', said rings K being radially slotted and held against rotation upon the discs E by studs or keys L tting into corresponding recesses or in other manner. A spring coil M surrounds the extended ends of the plates C, Which, as Will be seen are of greater depth or Width than would be possible without the use of the rings K, the object of said coil being, as in known practice, to give the plates a tendency to keep inwards. The rings K are held by distance rods N extending from top to bottom.

Referring now to Figs, 3 and 4, which show a form of the invention applied to a cutting head, the cutting plates O are shown in co-operative connection With a rotatable scroll P of known kind, the spiral turns of which act upon teeth Q in the plates, as seen in Fig. 4, thus causing the plates to slide in radial guide grooves R in the body S of the cutting head when the scroll P is turned for adjustment. The special means for increasing the range of the head so as to accommodate Wider or deeper cutting plates consists of a cylindrical sleeve T, suitably slotted to receive the plates O and applied tightly over the body S, and maintained there by a knurled nut U threaded upon an extension V of the body S. A screw W engaging in a slot Y or any equivalent device may be supplied for locating the sleeve 'I' with the degree of accuracy which is particularly essential, as will be obvious.

I claim:

1. In a tool for Working inside cylindrical surfaces of varying diameters, comprising a tool head having radial recesses formed in it, tool carrying members slidable in said recesses and means for expanding said tool carrying members by the rotation of a member centrally located in said tool-head,extension members adapted to be removably secured to said tool head, radial recesses in said extension members adapted to guide and steady said tool carrying members, means for securing exact alinement between the recesses of said tool head and of said extension members, and means for rigidly interconnecting said extension members in constant alinement with each other.

2. In a device of the character set forth in the preceding claim, positive means for inter-engagement between the tool-head and the extension members, adapted to secure exact alinement of the recesses respectively formed in said tool head and extension members and to prevent respective displacement thereof.

3. The combination with a tool head for a cylinder grinding tool comprising a pair of end members, slidable members for carrying the grinding elements, adapted to be expanded radially from the longitudinal center of said tool head, and guiding and steadying grooves for said slidable members said end members,-of a pair of annular extensions fitting around said end-members, guiding and steadying grooves in said annular extensions, positive means for securing exact alinement between the grooves in said end-members and said annular extensions, respectively, said positive means being adapted to inter-engage said annular extensions with said end members so as to prevent respective rotation thereof, and rods -for rigidly interconnecting said extension members in constant relationship to each other.

4. In a device of the character set forth in claim l, rigid rods interconnecting the extension members so as to maintain them in constant relationship to each other.

JOHN WILLIAM BAILEY. 

